我在Windows 10上通过以下操作解决了这个问题:

Run the following command in a Windows command prompt or Flutter console: flutter config --android-sdk "C:\Users\'your computer name' AppData\Local\Android\Sdk" (you may need to find and enter your own SDK path) The Android SDK location could be found in the Android Studio application* → Appearance & Behavior → System Settings → Android SDK Open your Android Studio, and then → File → Settings → Appearance & Behavior → System Settings → Android SDK → SDK Tools → download Android SDK Command-line Tools (latest) and you are good to go.

如果您已经下载了cmdline-tools和Android SDK，请确保Flutter没有在错误的目录中查找:

flutter config --android-sdk=""

MacOS用户

如果已经安装了android studio，只需运行:

flutter config --android-sdk "/Users/$USER/Library/Android/sdk" & flutter doctor --android-licenses

我的解决过程如下:

~/Library/Android/sdk/tools/bin/sdkmanager --install "cmdline-tools;latest" Exception in thread "main" java.lang.NoClassDefFoundError: javax/xml/bind/annotation/XmlSchema at com.android.repository.api.SchemaModule$SchemaModuleVersion.<init>(SchemaModule.java:156) at com.android.repository.api.SchemaModule.<init>(SchemaModule.java:75) at com.android.sdklib.repository.AndroidSdkHandler.<clinit>(AndroidSdkHandler.java:81) at com.android.sdklib.tool.sdkmanager.SdkManagerCli.main(SdkManagerCli.java:73) at com.android.sdklib.tool.sdkmanager.SdkManagerCli.main(SdkManagerCli.java:48) Caused by: java.lang.ClassNotFoundException: javax.xml.bind.annotation.XmlSchema at java.base/jdk.internal.loader.BuiltinClassLoader.loadClass(BuiltinClassLoader.java:636) at java.base/jdk.internal.loader.ClassLoaders$AppClassLoader.loadClass(ClassLoaders.java:182) at java.base/java.lang.ClassLoader.loadClass(ClassLoader.java:519) ... 5 more Install Android SDK Command-line Tools in Android Studio: Preferences → Appearance & Behavior → System Settings → Android SDK → SDK Tools → Android SDK Command-line Tools (latest) flutter doctor Doctor summary (to see all details, run flutter doctor -v): [✓] Flutter (Channel stable, 2.5.0, on macOS 11.5.2 20G95 darwin-x64, locale zh-Hans-CN) [✓] Android toolchain - develop for Android devices (Android SDK version 29.0.3) [✓] Xcode - develop for iOS and macOS [✓] Chrome - develop for the web [✓] Android Studio (version 2020.3) [✓] IntelliJ IDEA Ultimate Edition (version 2021.2) [✓] IntelliJ IDEA Ultimate Edition (version 2021.2) [✓] Connected device (2 available) • No issues found!

从Android Studio打开SDK管理器。 SDK工具页 如图所示，检查Android SDK命令行工具 适用。 然后再跑扑医生

由于我的Android Studio开始屏幕看起来与上面的答案不同，我想分享我的解决方案:

打开Android Studio，点击欢迎屏幕上的“more actions”。 点击“SDK管理器”

在“*首选项”窗口转到“*SDK Tools•”选项卡 选择“Android SDK命令行工具(最新)”复选框。 点击“应用”。